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This study evaluated spatial Φ th inside a 70kg water phantom using the NAA method. Fifty indium foils were placed inside the water phantom and exposed under 15MV LINAC for 2.5min to yield the 10Gy X-ray dose. The Φ th value at the isocenter of the water was 1.03×10 6 ncm −2 /Gy-X, and the maximum quantity of Φ th appeared at the water surface along the z-axis,...
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